Microsoft September 2021 Patch Tuesday fixes 2 zero-days, 60 flaws – BleepingComputer

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Today is Microsoft’s September 2021 Patch Tuesday, and with it comes fixes for two zero-day vulnerabilities and a total of 60 flaws.
Microsoft has fixed 60 vulnerabilities (86 including Microsoft Edge) with today’s update, with three classified as Critical, one as Moderate, and 56 as Important.
Of the total 86 vulnerabilities (including Microsoft Edge):
For information about the non-security Windows updates, you can read about today’s Windows 10 KB5005565 & KB5005566 cumulative updates.
Microsoft has released a security update for the Windows MSHTML remote code execution vulnerability tracked as CVE-2021-40444.
Last Tuesday, Microsoft disclosed a new zero-day Windows MSHTML remote code execution vulnerability that threat actors actively used in phishing attacks.
These attacks distributed malicious Word documents that exploited the CVE-2021-40444 to download and execute a malicious DLL file that installed a Cobalt Strike beacon on the victim’s computer.
This beacon allows a threat actor to gain remote access to the device to steal files and spread laterally throughout the network.
Soon after Microsoft disclosed the vulnerability, threat actors and security researchers began sharing guides on exploiting the vulnerability, which allowed anyone to start using it in attacks, as demonstrated below.
With the September 2021 Patch Tuesday updates, Microsoft has released a security update for this vulnerability.
As researchers discovered numerous ways to exploit the bug, including a bypass to mitigations, it is not clear if the security update fixes all of the techniques.
September’s Patch Tuesday includes fixes for two zero-day vulnerabilities, with the MSHTML bug actively exploited in the wild.
Microsoft classifies a vulnerability as a zero-day if publicly disclosed or actively exploited with no official security updates released.
The publicly disclosed, but not actively exploited, zero-day vulnerability is:
The only actively exploited vulnerability is the Windows MSHTML remote code execution vulnerability, as previously discussed:
Other vendors who released updates in July include:
Below is the complete list of resolved vulnerabilities and released advisories in the September 2021 Patch Tuesday updates. To access the full description of each vulnerability and the systems that it affects, you can view the full report here.
New Windows security updates break network printing
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Windows MSHTML zero-day defenses bypassed as new info emerges
All Windows versions impacted by new LPE zero-day vulnerability
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